List of practice Questions

Azotobacter and Bacillus polymyxa are the examples of
A linear harmonic oscillator of force constant $ 2 \times 10^6 $ N/m and amplitude 0.01 m has a total mechanical energy of 160 J. Show that its (a) maximum potential energy is 160 J (b) maximum kinetic energy is 100J
Among the following oxides, the least acidic is
Cyclopropane and oxygen at partial pressures 170 torr and 570 torr are mixed in a gas cylinder. What is the ratio of the number of moles of cyclopropane to the number of moles of oxygen?
What is the molarity of $H_2SO_4$ solution that has a density of 1.84 g/cc at 35$^\circ$C and contains 98% by weight ?
Cuprous compounds such as $CuCl, CuCN$ and $CuSCN$ are the only salts stable in $H_2O $ due to
If there are 4 cells in anthers, what will be the number of pollen grains?
Which one of the following elements is almost non- essential for plants?
Oxidative phosphorylation involves simultaneous oxidation and phosphorylation to finally form
Which one of the following fish is introduced 65. into India by foreigners?
In C4 plants, CO2 combines with
Which of the following is a 'true fruit'?
Synthetic polymer which resemble natural rubber is
Genetically engineered bacteria have been successfully used in the commercial production of
A 5 A current is passed through a solution of zinc sulphate for 40 min. The amount of zinc deposited at the cathode is
Lungs are enclosed in :
Two equal electric currents are flowing perpendicular to each other as shown in the figure. AB and CD are perpendicular to each other and symmetrically placed with respect to the currents. Where do we expect the resultant magnetic field to be zero?
0.24 g of a volatile gas, upon vaporisation, gives 45 mL vapour at NTP. What will be the vapour density of the substance ? (Density of $ H_2 = 0.089$)
The energy of a hydrogen atom in its ground state is - 13.6 eV. The energy of the level corresponding to the quantum number n = 2 in the hydrogen atom is
A moving body of mass $m$ and velocity $3\, km / hr$. Collides with a body at rest and of mass $2\, m$ and then sticks to it. Now the combined mass starts to move, then the combined velocity will be :
Benthoic animals are those, which
Cochineal insects have proved very useful for
The momentum of a particle having a de-Broglie wavelength of $10^{17}$ m is (Given, $h = 6.625 \times 10^{-34}$ m)
During dialysis
When npn transistor is used as an amplifier, then